出现了一个错误。试图制作一个Lua脚本，当玩家杀死一个玩家时获得奖励Roblox

Hrph. 以下代码有什么问题吗？欢迎提出任何的改进

local function OnPlayerJoin(player)
    local leaderstats = Instance.new ("Folder")
    local currency1 = Instance.new ("IntValue")

    leaderstats.Name = "leaderstats"
    currency1.Name = "Gold"

    leaderstats.Parent = player
    currency1.Parent = leaderstats

    game.Players.CharacterAdded:connect(function(character)
        local Humanoid.Died:connect(function()
            if Humanoid:FindFirstChild("creator") ~=nil then
                local killer = Humanoid.creator.Value
                currency1 = currency1 + 5
            end
        end)
    end)

game.Players.PlayerAdded:Connect(OnPlayerJoin)

end